Brutally

[Justin Bieber]

It’s an [adverb] that can be used in a number of different ways:
1 It can mean particularly savage and violent;
2 It can mean in a direct and uncompromising way, where no attempt is made to [disguise] [unpleasantness];
3 It can mean to an extremely unpleasant or harsh degree;

[Marquetta]

in a very cruel and violent way:

[Dorothey Allen]

In a savagely violent way.